Assertion (A): If the matrix \( A=\left[\begin{array}{ccc}1 & 3 & \lambda+2 \\ 2 & 4 & 8 \\ 3 & ....

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Assertion (A): If the matrix \( A=\left[\begin{array}{ccc}1 & 3 & \lambda+2 \\ 2 & 4 & 8 \\ 3 & 5 & 10\end{array}\right] \) is singular, then \( \lambda=4 \).
Reason (R): If \( \mathrm{A} \) is a singular matrix, then \( |A|=0 \).
(A) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true and \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \)
(B) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true but \( \mathrm{R} \) is not the correct explanation of \( \mathrm{A} \)
(C) \( \mathrm{A} \) is true but \( \mathrm{R} \) is false
(D) \( \mathrm{A} \) is false and \( \mathrm{R} \) is true


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